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Fix examples failing to send more than one JACK midi event per frame

--- a/examples/utils.c

+++ b/examples/utils.c

@@ -75,8 +75,11 @@

 extern int parse_args (int argc, char **argv);

 #if HAVE_JACK

+#define MAX_MIDI_EVENTS 128

 aubio_jack_t *jack_setup;

 jack_midi_event_t ev;

+jack_midi_data_t midi_data[MAX_MIDI_EVENTS * 3];

+size_t midi_event_count = 0;

 #endif /* HAVE_JACK */

 void examples_common_init (int argc, char **argv);

@@ -128,9 +131,6 @@

 void examples_common_del (void)

 {

-#ifdef HAVE_JACK

-  if (ev.buffer) free(ev.buffer);

-#endif

   del_fvec (ibuf);

   del_fvec (obuf);

   aubio_cleanup ();

@@ -147,7 +147,6 @@

 #ifdef HAVE_JACK

     ev.size = 3;

-    ev.buffer = malloc (3 * sizeof (jack_midi_data_t));

     ev.time = 0; // send it now

     debug ("Jack activation ...\n");

     aubio_jack_activate (jack_setup, process_func);

@@ -193,6 +192,10 @@

 {

 #ifdef HAVE_JACK

   if (usejack) {

+    ev.buffer = midi_data + midi_event_count++ * 3;

+    if (midi_event_count >= MAX_MIDI_EVENTS) {

+      midi_event_count = 0;

+    }

     ev.buffer[2] = velo;

     ev.buffer[1] = pitch;

     if (velo == 0) {